21699547512 has 32 divisors (see below), whose sum is σ = 57104073600. Its totient is φ = 6852488544.

The previous prime is 21699547489. The next prime is 21699547561. The reversal of 21699547512 is 21574599612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23792908 + ... + 23793819.

It is an arithmetic number, because the mean of its divisors is an integer number (1784502300).

Almost surely, 2^21699547512 is an apocalyptic number.

It is an amenable number.

21699547512 is an abundant number, since it is smaller than the sum of its proper divisors (35404526088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21699547512 is a wasteful number, since it uses less digits than its factorization.

21699547512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47586755 (or 47586751 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 51.

The spelling of 21699547512 in words is "twenty-one billion, six hundred ninety-nine million, five hundred forty-seven thousand, five hundred twelve".